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    On a chemistry unit 1 past paper it asked for the electron configuration of a rubidium atom, which has a proton number of 37.

    I wrote, 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d1
    However the answer is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1

    I understand that rubidium is in group 1 and the s block so 5s1 makes sense, but I thought that there were the 4d and 4f sub-shells before the 5s one so I'm confused why it jumps from 4p to 5s?
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    (Original post by rfours)
    On a chemistry unit 1 past paper it asked for the electron configuration of a rubidium atom, which has a proton number of 37.

    I wrote, 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d1
    However the answer is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1

    I understand that rubidium is in group 1 and the s block so 5s1 makes sense, but I thought that there were the 4d and 4f sub-shells before the 5s one so I'm confused why it jumps from 4p to 5s?
    It's exactly the same reason the 4s is filled before the 3d
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    (Original post by rfours)
    On a chemistry unit 1 past paper it asked for the electron configuration of a rubidium atom, which has a proton number of 37.

    I wrote, 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d1
    However the answer is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1

    I understand that rubidium is in group 1 and the s block so 5s1 makes sense, but I thought that there were the 4d and 4f sub-shells before the 5s one so I'm confused why it jumps from 4p to 5s?
    The 4d orbital has a slightly higher energy level than the 5s orbital so the 5s orbital fills first (just as with the 4s and 3d orbitals earlier on, which you have correctly filled in.)
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    Thank you!
 
 
 

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